viber + win 10 problem ... viber running in background... viber is in the system tray, is in the running program in the task manager, but the program interface does not want to open.... I can not open and use it... help... was reinstalled without success .. what to do?

viber is no more bothered about windows , not even windows phone, viber on my lumia 640 xl is pathetic and i quit it , now m using watsapp calling , suggest u to switch watsapp web , line or skype instead of viber ( try tango also )